JP2002119003A - Stator of rotating electric machine and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a stator for a rotating electric machine and a method for manufacturing the same, which can reduce the amount of heating at the time of joining and can prevent damage to an insulating coating of a conductor. A stator core having a plurality of slots is provided.
2 and the stator 2 of the rotating electrical machine, which is provided in the slot 35 and has a stator winding in which the joining ends 33a of the plurality of conductors 33 are joined to each other, the joining portion of the joining end 33a is a conductor 33 33g, 33f of molten metal with lower melting point than
It is composed of

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine having a stator winding formed by joining a plurality of conductors to each other and a method of manufacturing the same, and more particularly to an improvement in a joint between stator winding conductors. Things.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a cross-sectional view illustrating the entire structure of a vehicle alternator described in Japanese Patent Publication No. 0-205. FIG.
730 is a partial perspective view of a stator showing a state in which four conductors are inserted into each slot described in Japanese Patent Publication No. 730. In FIG. 9, the vehicle alternator 1 includes a stator 2, a rotor 3, a frame 4, a rectifier 5, and the like.

The stator 2 includes a stator core 32 and conductor segments 3 as a plurality of electric conductors constituting a stator winding.
3 and an insulator 34 for electrically insulating the stator core 32 and the conductor segment 33 from each other. The stator core 32 is formed by laminating thin steel plates,
A number of slots are formed on the inner peripheral surface. The conductor segment 33 exposed from the stator core 32 forms the coil end 31 of the stator winding.

The rotor 3 includes a field coil 8 formed by winding an insulated copper wire in a cylindrical and concentric manner, each of which has 6 coils.
It has a configuration in which it is sandwiched from both sides through a shaft 6 by a pole core 7 having a plurality of claw portions. An axial-flow-type cooling fan 11 is attached to the end face of the pole core 7 on the front side by welding or the like to discharge the cooling air sucked from the front side in the axial direction and the radial direction. Similarly, a centrifugal cooling fan 12 is attached to the end face of the rear pole core 7 by welding or the like to discharge the cooling air sucked from the rear side in the radial direction.

[0005] The frame 4 houses the stator 2 and the rotor 3. The rotor 3 is supported rotatably about a shaft 6, and is mounted on the outer peripheral side of the pole core 7 of the rotor 3. Stator 2 arranged via a predetermined gap
Has been fixed. The frame 4 has a cooling air discharge hole 42 in a portion of the stator 2 facing the coil end 31.
However, suction holes 41 are provided on the axial end surfaces, respectively.

A vehicle alternator 1 having the above-described structure.
When a rotational force from an engine (not shown) is transmitted to the pulley 20 via a belt or the like, the rotor 3 rotates in a predetermined direction. In this state, by applying an excitation voltage to the field coil 8 of the rotor 3 from the outside, each claw portion of the pole core 7 is excited, and a three-phase AC voltage can be generated in the stator winding. A predetermined DC current is taken out from the output terminal 5.

In FIG. 10, four conductor segments 33 accommodated in one slot 35 alternately extend in the circumferential direction. In FIG. 10, the outermost periphery illustrated in the foreground extends in the clockwise direction, and the innermost periphery located in the innermost region extends in the counterclockwise direction. The end 33a of each conductor segment 33 is joined to the end 33a of another conductor segment 33 extending from another slot 35 separated by a predetermined pitch. In FIG. 10, the innermost conductor segment 33 and the second layer conductor segment 33 are joined, and the third layer conductor segment 33 and the outermost layer conductor segment 33 are joined. Therefore, the plurality of joints 33b are arranged in a double annular shape on the inner peripheral side and the outer peripheral side,
The joints 33b are spaced apart from each other in both the circumferential direction and the radial direction. In addition, each joint 33
By performing the joining of b by TIG welding, each joining portion 33b is formed in a drop-shaped ball shape without an edge.

[0008]

In the stator of the rotating electric machine having such a configuration, since each joint 33b is heated and joined at a temperature higher than the melting point of the conductor 33, each joint 33b is heated.
The nearby insulating coating may be damaged, and short-circuit failure may occur between adjacent conductors.

Further, the arrangement of the conductors 33 is dense, and
When the target of the heat source is shifted because the 3a are close to each other, there is a possibility that the heat source is joined to another joining portion 33b which is adjacent in the radial direction.

Furthermore, since a large number of joints 33b are joined one by one in order, productivity is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to reduce the amount of heating at the time of joining and to prevent damage to an insulating film of a conductor. And a method for producing the same.

[0012]

SUMMARY OF THE INVENTION A stator for a rotating electric machine according to the present invention has a stator core having a plurality of slots and a stator provided in the slots and having a plurality of conductors joined to each other. In the stator of the rotating electric machine having the winding, the joint at the joint end is formed of a molten metal having a lower melting point than the conductor.

The molten metal is an alloy of a conductor material and an additive metal.

The additive metal is a Cu-P alloy.

The additive metal is Ag or an Ag alloy.

The additive metal is Sn or a Sn alloy.

Further, according to the method of manufacturing a stator for a rotating electric machine according to the present invention, a stator core having a plurality of slots and a stator winding provided in the slots and joined to each other at the joining ends of a plurality of conductors are provided. A method of manufacturing a stator of a rotating electric machine having a wire, an insert metal disposing step of interposing an insert metal having a lower melting point than a conductor between joint ends of the conductor, the insert metal being melted, and A step of heating the vicinity of the joining end to a temperature at which the part does not melt, melting the insert metal, and then terminating the heating to solidify the insert metal and join the joining ends.

Further, according to a method of manufacturing a stator of a rotating electric machine according to the present invention, a stator core having a plurality of slots and a stator winding provided in the slots and joined to each other at the joining ends of a plurality of conductors are provided. A method for manufacturing a stator of a rotating electric machine having a wire, an insert metal arranging step of sandwiching an insert metal having a lower melting point than a conductor between joint ends of the conductor, and a joining end portion at a temperature at which the insert metal melts. Heat the neighborhood,
After the conductor end and the insert metal are melt-alloyed, the heating is terminated to solidify the molten alloy and join the joining ends.

Also, two or more sets of joining ends to be joined are aligned in the radial direction, and no insert metal is sandwiched between the joining ends of adjacent sets.

A plurality of sets of joining ends to be joined are arranged in the circumferential direction, and the insert metal sandwiched between the joining ends is connected in the circumferential direction.

The cross-sectional area of the connecting portion of the insert metal is smaller than the cross-sectional area of the portion sandwiched between the joining ends.

In the joining step, the vicinity of the joining end is heated by a non-contact heat source.

The joining step is resistance heating in which an electrode is brought into contact with the joining end to conduct current and heat the joint. Two or more sets of joining ends arranged in the radial direction are arranged on the inner diameter side and the outer diameter side. It is sandwiched between the two electrodes and heated.

Further, the two electrodes arranged on the inner diameter side and the outer diameter side each have a roller shape, and heat the inside and outside of the plurality of sets of the joined end portions arranged in the circumferential direction while rolling.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a perspective view of a joined conductor portion showing an embodiment of a stator of a rotating electric machine according to the present invention. In the present embodiment, the conductor 33
The insulating film 33c is peeled off in advance at the end 33a. The joint 33e of the joint end 33a is connected to the conductor 3
It is composed of a molten metal 33f having a melting point lower than 3.
Other configurations are substantially the same as those of the related art.

FIG. 2 is a process flow chart for explaining a method of joining conductor ends according to the present embodiment. In the present embodiment, first, in step S51, an insert metal 33f having a melting point lower than that of the conductor 33 is sandwiched between two joining ends 33a to be joined (insert metal disposing step). Note that the insulating coating 33c on the end 33a is peeled off in advance.

Next, in step S52, the vicinity of the joining end is heated to a temperature at which the insert metal 33f melts and the conductor end 33a does not melt. That is, only the insert metal 33f is melted. Note that, as the heat source 91, an electric arc which is a non-contact heat source is used.

Thereafter, in step S53, the heat source 91 is stopped and the heating is terminated, thereby solidifying the insert metal 33f and joining the joining ends 33a (joining step).

The heat source 91 used in the bonding step includes:
Alternatively, a non-contact heat source such as a plasma arc, a laser, and an electron beam may be used.

As described above, in the stator of the rotating electric machine according to the present embodiment, the joint 33e of the joint end 33a is made of the molten metal 33f having a lower melting point than the conductor 33. Therefore, the amount of heating at the time of joining can be reduced, and the temperature rise of the conductor 33 can be suppressed.
Damage can be prevented.

The method of manufacturing a stator for a rotating electric machine according to the present embodiment is characterized in that the conductor 33 is provided between the joining ends 33 a of the conductor 33.
An insert metal arranging step of sandwiching the insert metal 33f having a lower melting point (step S51); and heating the vicinity of the joining end to a temperature at which the insert metal 33f is melted and the conductor end 33a is not melted. After the melting (Step S52), the heating is terminated to solidify the insert metal 33f (Step S5).
2) a joining step of joining the joining ends 33a. Therefore, the amount of heating at the time of joining can be reduced,
Further, since the temperature rise of the conductor 33 can be suppressed, damage to the insulating coating 33c can be prevented.

Further, heating near the joint end (step S5)
2) is performed with a non-contact heat source. Therefore, the temperature of the bonding end can be raised to the bonding achievement temperature in a short time, and the insulating coating 3 of the conductor can be obtained.
3c can be further prevented from being damaged.

Embodiment 2 FIG. FIG. 3 is a perspective view of a joined conductor portion showing another embodiment of the stator of the rotating electric machine according to the present invention. In the present embodiment, the joining end 33
The joint 33e of a is made of an alloy of the conductor 33 and the additional metal 33g. 33 g of this additional metal is, for example, Cu
-P alloy, Ag or Ag alloy, Sn or Sn alloy. Other configurations are substantially the same as those of the first embodiment.

FIG. 4 is a process flow chart for explaining a method of joining conductor ends according to the present embodiment. In the present embodiment, first, in step S61, an insert metal (addition metal) 33g having a lower melting point than the conductor 33 is interposed between two joining ends 33a to be joined (insert metal disposing step).

Next, in step S62, the vicinity of the joint end is heated to melt the insert metal 33g, and in step S63, the insert metal 33g and the conductor 33 are alloyed by further heating. That is, the conductor end and the insert metal 33g are melt-alloyed. Note that, as the heat source 92, an electric arc which is a non-contact heat source is used.

Thereafter, in step S64, the heating is terminated to solidify the molten alloy and join the joining ends (joining step).

As described above, in the stator of the rotating electric machine of the present embodiment, the molten metal 33 g
3 g of alloy. Therefore, the strength of the joint 33e can be improved. Further, 33 g of the additional metal is Cu-
P alloy. Therefore, when the conductor 33 is copper,
Can be securely joined without using flux,
No post-processing is required.

Further, 33 g of the additional metal is Ag or an Ag alloy. Therefore, when the conductor 33 is made of copper, an alloy reaction occurs with a small amount of heating, and damage to the insulating coating of the conductor can be prevented. Further, 33 g of the additional metal is S
n or Sn alloy. Therefore, when the conductor is copper, an alloy reaction occurs with a small amount of heating, and damage to the insulating coating of the conductor can be prevented.

Further, the method of manufacturing a stator for a rotating electric machine according to the present embodiment is characterized in that the conductor 3 is provided between the joining ends 33 a of the conductor 33.
An insert metal arranging step of sandwiching the insert metal 33g having a melting point lower than that of Step 3 (Step 61), the vicinity of the joining end is heated to a temperature at which the insert metal 33g melts, and the conductor end and the insert metal 33g are melt alloyed ( After steps 62 and 63), a heating step is completed to solidify the molten alloy (step 64), and a bonding step of bonding between the bonding ends 33a is included. Therefore, insert metal 33
g becomes a molten alloy with the conductor, and the strength of the joint 33e can be improved. In the method for manufacturing the stator of the rotating electric machine according to the present embodiment, insert metal 33g is used for melt-alloying with the conductor end, but plating material having a lower melting point than conductor 33 is applied to conductor 33. The same effect can be obtained even if a filler rod having a lower melting point than the conductor 33 is supplied.

Embodiment 3 FIG. 5 is a process flow chart illustrating another embodiment of the method for manufacturing the stator of the rotating electric machine according to the present invention. In the present embodiment, first, in step S71, an insert metal (addition metal) 33f having a lower melting point than the conductor 33 is interposed between the two sets of joining ends 33a to be joined (insert metal disposing step). .

Next, in step S72, two sets of joint ends 33a aligned in the radial direction are sandwiched together by two electrodes 93a and 93b arranged on the inner and outer diameter sides, and are applied from both sides. Apply voltage while pressing. Of the two sets of the joining ends 33a, the inner two joining ends 33a are pressed from both sides and come into contact, current flows between the electrodes 93a and 93b, and the insert metal is melted by resistance heating.

Thereafter, in step S73, the current is stopped before the conductor 33 is melted, the insert metal 33f is solidified, and the joining ends 33a are joined (joining step).

As described above, according to the method of manufacturing the stator of the rotating electric machine of the present embodiment, two sets of the joining ends 33a to be joined are aligned in the radial direction, and between the joining ends 33a of the adjacent sets.
The insert metal 33f is not sandwiched. For this reason, since the insert metal 33f is not sandwiched between the joining ends 33a of the adjacent sets, it is not joined to the joining parts of the other sets.

In the method of manufacturing a stator for a rotating electric machine according to the present embodiment, step S72 is resistance heating in which the electrodes 93a and 93b are brought into contact with the joint end 33a to conduct current and generate heat. End portions 33a aligned in two sets
Are connected to two electrodes 93a, 93 arranged on the inner diameter side and the outer diameter side.
3b and heat together. Therefore, a plurality of joining ends 33a aligned in the radial direction can be joined at the same time, and productivity is improved.

In this embodiment, a pair of joining ends 33a to be joined are aligned in two sets in the radial direction.
Even if two or more sets of the joining end portions 33a to be joined are aligned, it is possible to heat them by sandwiching them between the two electrodes 93a and 93b.

Embodiment 4 FIG. FIG. 6 is a process flow chart for explaining another embodiment of the method for manufacturing the stator of the rotating electric machine according to the present invention. In the present embodiment, first, in step S81, an insert metal (addition metal) 33g having a lower melting point than the conductor 33 is sandwiched between the two sets of joining ends 33a to be joined (insert metal disposing step). .

Next, in step S82, two sets of joining ends 33a aligned in the radial direction are sandwiched together by two electrodes 93a and 93b arranged on the inner and outer diameter sides, and are applied from both sides. Apply voltage while pressing. Of the two sets of bonding ends 33a, the inner two bonding ends 33a are pressed from both sides and come into contact, a current flows between the electrodes 93a and 93b, and the insert metal is melted by resistance heating. Then, in step S83, the power is further supplied to insert metal 33.
g and the conductor 33 are melt-alloyed.

Thereafter, in step S84, the energization is stopped to solidify the molten alloy and join the joining ends (joining step).

As described above, in the method for manufacturing the stator of the rotating electric machine according to the present embodiment, the steps S 82 and 83
This is resistance heating in which the electrodes 93a and 93b are brought into contact with 3a to conduct current and generate heat, and two sets of bonding end portions 33a arranged in the radial direction are provided on two electrodes 93a and 93b arranged on the inner diameter side and the outer diameter side. Heat together with 93b. Therefore, a plurality of joining ends 33a aligned in the radial direction can be joined at the same time, and productivity is improved.

Embodiment 5 FIG. 7 is a view showing a group of conductor ends before joining, viewed from the direction of the rotating shaft of the generator, showing another embodiment of the method for manufacturing a stator of a rotating electric machine according to the present invention. In the present embodiment, a pair of joining ends 33a to be joined are aligned in two sets in the radial direction, and a large number of sets are aligned in the circumferential direction. The insert metal 44 sandwiched between the conductor ends 33a aligned in the circumferential direction is connected to each other, and further, the connection portion 44b becomes a portion 44a sandwiched between the conductor ends.
Smaller in cross-sectional area. Other configurations are the same as those of the third or fourth embodiment. The connecting portion 44b having a small cross section is
At the time of resistance heating, the joints 44a are melted and separated spontaneously, and the respective joints 44a become independent.

As described above, in the method of manufacturing the stator of the rotating electric machine according to the present embodiment, a plurality of sets of the joining ends 33a to be joined are aligned in the circumferential direction, and the insert metal sandwiched between the joining ends 33a is provided. 44 are connected in the circumferential direction. Therefore, since the insert metals 44 are connected, the work of inserting the insert metals 44 between the plurality of sets of the joining ends 33a is facilitated, and the workability is improved.

The connecting portion 44b of the insert metal 44
Is smaller than the cross-sectional area of the portion 44a sandwiched between the joining ends. Therefore, the connecting portion 44b is spontaneously melted and separated by the heating at the time of joining, and each joining portion 44a becomes independent. Therefore, the cutting work of the connecting portion 44b becomes unnecessary and the workability is improved.

Embodiment 6 FIG. FIG. 8 is a view of a group of conductor ends during joining, viewed from the direction of the rotating shaft of the generator, showing another embodiment of the method of manufacturing a stator for a rotating electric machine according to the present invention. In the present embodiment, two pairs of joining ends 33a to be joined are aligned in the radial direction. The two electrodes 94a and 94b arranged on the inner diameter side and the outer diameter side which sandwich the aligned two sets of the joining ends 33a together form a roller shape, and a plurality of sets of the joining ends aligned in the circumferential direction. Electricity is applied while rolling inside and outside the group, and resistance heating is performed. Other configurations are the same as those of the third or fourth embodiment.

As described above, in the method of manufacturing the stator of the rotating electric machine according to the present embodiment, the two electrodes 94a and 94b arranged on the inner diameter side and the outer diameter side each have a roller shape, and a plurality of Electric current is applied while rolling the inside and outside of the joined end group arranged in pairs, and resistance heating is performed. Therefore, the plurality of bonding ends 33a aligned in the radial direction can be simultaneously bonded, and the plurality of bonding ends 33a aligned in the circumferential direction can be continuously bonded. The performance is improved.

In this embodiment, a pair of joining ends 33a to be joined are aligned in two sets in the radial direction.
Even if two or more sets of the joining end portions 33a to be joined are aligned, it is possible to heat them by sandwiching them between the two electrodes 94a and 94b.

[0056]

According to the present invention, a stator for a rotating electric machine includes a stator core having a plurality of slots, and a stator winding provided in the slots and formed by joining joining ends of a plurality of conductors to each other. In a stator of a rotating electric machine having the same, a joint at a joint end is made of a molten metal having a lower melting point than a conductor. Therefore, the amount of heating at the time of joining can be reduced, and a rise in the temperature of the conductor can be suppressed, so that damage to the insulating coating can be prevented.

The molten metal is an alloy of a conductor material and an additive metal. For this reason, the strength of the joint can be improved.

The additive metal is a Cu-P alloy.
Therefore, when the conductor is made of copper, the bonding can be surely performed without using a flux, and post-processing is not required.

The additive metal is Ag or an Ag alloy. Therefore, when the conductor is copper, an alloy reaction occurs with a small amount of heating, and damage to the insulating coating of the conductor can be prevented.

The additional metal is Sn or a Sn alloy. Therefore, when the conductor is copper, an alloy reaction occurs with a small amount of heating, and damage to the insulating coating of the conductor can be prevented.

Further, according to a method of manufacturing a stator of a rotating electric machine according to the present invention, a stator core having a plurality of slots and a stator winding provided in the slots and joined to each other at the joining ends of a plurality of conductors are provided. A method of manufacturing a stator of a rotating electric machine having a wire, an insert metal disposing step of interposing an insert metal having a lower melting point than a conductor between joint ends of the conductor, the insert metal being melted, and A step of heating the vicinity of the joining end to a temperature at which the portion does not melt, melting the insert metal, and then terminating the heating to solidify the insert metal and join the joining ends. Therefore, the amount of heating at the time of joining can be reduced, and a rise in the temperature of the conductor can be suppressed, so that damage to the insulating coating can be prevented.

A method of manufacturing a stator for a rotating electric machine according to the present invention provides a stator core having a plurality of slots and a stator winding provided in the slots and joined to each other at the joining ends of a plurality of conductors. A method for manufacturing a stator of a rotating electric machine having a wire, an insert metal arranging step of sandwiching an insert metal having a lower melting point than a conductor between joint ends of the conductor, and a joining end portion at a temperature at which the insert metal melts. Heat the neighborhood,
After the conductor end and the insert metal are melt-alloyed, the heating is terminated to solidify the molten alloy and join the joining ends. Therefore, the insert metal is melt-alloyed with the conductor, and the strength of the joint can be improved.

Further, two or more sets of joining ends to be joined are aligned in the radial direction, and the insert metal is not sandwiched between the joining ends of the adjacent sets. Therefore, since the insert metal is not sandwiched between the joining ends of the adjacent sets, it is not joined to the joining parts of the other sets.

A plurality of sets of joining ends to be joined are aligned in the circumferential direction, and the insert metal sandwiched between the joining ends is connected in the circumferential direction. Therefore, since the insert metals are connected, the work of inserting the insert metals between a plurality of sets of joining ends can be easily performed, thereby improving workability.

The cross-sectional area of the connecting portion of the insert metal is smaller than the cross-sectional area of the portion sandwiched between the joining ends.
For this reason, the connecting portion is naturally melted and separated by the heating at the time of joining, and each joining portion becomes independent, so that the cutting work of the joining portion becomes unnecessary and the workability is improved.

In the melting step, the vicinity of the joining end is heated by a non-contact heat source. Therefore, the temperature of the bonding end can be raised to the bonding achievement temperature in a short time, and damage to the insulating coating of the conductor can be prevented.

The melting step is resistance heating in which an electrode is brought into contact with the bonding end to conduct current and generate heat. Two or more sets of bonding ends aligned in the radial direction are arranged on the inner diameter side and the outer diameter side. It is sandwiched between the two electrodes and heated. Therefore, a plurality of joining ends aligned in the radial direction can be joined at the same time, and productivity is improved.

Further, the two electrodes arranged on the inner diameter side and the outer diameter side each have a roller shape, and a current is supplied while rolling inside and outside a plurality of sets of joined end portions arranged in the circumferential direction, and resistance heating is performed. I do. Therefore, a plurality of joining ends aligned in the radial direction can be simultaneously joined, and a plurality of joining ends aligned in the circumferential direction can be joined continuously, so that the joining operation can be performed in a short time and productivity can be improved. improves.

[Brief description of the drawings]

FIG. 1 is a perspective view of a joined conductor portion showing a first embodiment of a stator of a rotating electric machine according to the present invention.

FIG. 2 is a process flowchart illustrating a method of joining conductor ends according to the first embodiment;

FIG. 3 is a perspective view of a joined conductor portion showing a second embodiment of the stator of the rotating electric machine according to the present invention.

FIG. 4 is a process flowchart illustrating a method of joining conductor ends according to a second embodiment.

FIG. 5 is a process flowchart illustrating Embodiment 3 of a method of manufacturing a stator for a rotating electric machine according to the present invention.

FIG. 6 is a process flowchart illustrating Embodiment 4 of a method of manufacturing a stator for a rotating electric machine according to the present invention.

FIG. 7 is a view showing a group of conductor ends before joining, viewed from the rotating shaft direction of the generator, showing another embodiment 5 of the method of manufacturing the stator for the rotating electric machine according to the fifth embodiment of the present invention.

FIG. 8 is a view of a group of conductor ends during joining, as viewed from the rotating shaft direction of the generator, showing another embodiment 6 of the method for manufacturing the stator of the rotating electric machine according to the present invention.

FIG. 9 is a cross-sectional view showing the entire structure of a conventional vehicle alternator.

FIG. 10 is a partial perspective view of a stator showing a state in which four conductors are inserted into each slot.

[Explanation of symbols]

33 conductor, 33a joint end, 33f, 33g insert metal (molten metal), S51, S61, S71, S
81 Insert Metal Placement Step, S52, S62, S6
3, S72, S82, S83 melting step, S53, S6
4, S73, S84 joining process, 91, 92 heat source, 9
3a, 93b, 94a, 94b Electrodes.

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 5H603 AA09 BB01 BB02 BB05 BB09 BB12 CA01 CA05 CB03 CB18 CB19 CC03 CC17 CD02 CD21 CD22 CE05 CE12 CE16 EE01 EE13 5H604 AA05 AA08 BB01 BB03 BB08 BB14 CC03 CC03 PC02 DA02 QB15 5H615 AA01 BB01 BB02 BB05 BB07 BB14 PP01 PP14 QQ03 SS16 SS18 TT12 TT16

Claims (13)

[Claims] 1. A stator for a rotating electrical machine, comprising: a stator core having a plurality of slots; and a stator winding provided in the slot and having joining ends of a plurality of conductors joined to each other. A stator for a rotating electric machine, wherein a joint at an end is made of a molten metal having a lower melting point than the conductor. 2. The stator according to claim 1, wherein the molten metal is an alloy of a material of the conductor and an additional metal. 3. The stator according to claim 2, wherein the additive metal is a Cu—P alloy. 4. The stator according to claim 2, wherein the additive metal is Ag or an Ag alloy. 5. The stator according to claim 2, wherein the additional metal is Sn or a Sn alloy. 6. A method of manufacturing a stator for a rotating electrical machine, comprising: a stator core having a plurality of slots; and a stator winding provided in the slots and having joining ends of a plurality of conductors joined to each other. An insert metal arranging step of interposing an insert metal having a lower melting point than the conductor between the joint ends of the conductor; and joining the insert metal to a temperature at which the insert metal is melted and the conductor end is not melted. Heating the end portion and melting the insert metal, and then terminating the heating to solidify the insert metal and join the joining end portions. Method of manufacturing stator for electric machine. 7. A method for manufacturing a stator of a rotating electric machine, comprising: a stator core having a plurality of slots; and a stator winding provided in the slot and having joining ends of a plurality of conductors joined to each other. An insert metal disposing step of interposing an insert metal having a lower melting point than the conductor between the joining ends of the conductor; heating the vicinity of the joining end to a temperature at which the insert metal is melted; After the alloying of the insert metal with the molten metal, by ending the heating, the molten alloy is solidified,
And a joining step of joining the joining end portions to each other. 8. The pair of joining ends to be joined are aligned in two or more sets in the radial direction, and the insert metal is not sandwiched between the joining ends of adjacent sets. Or the manufacturing method of the stator of the rotary electric machine as described in 7. 9. A plurality of sets of the joining ends to be joined are arranged in a plurality in the circumferential direction, and the insert metal sandwiched between the joining ends is connected in the circumferential direction. Item 6
9. The method for manufacturing a stator for a rotating electric machine according to any one of claims 1 to 8. 10. The method according to claim 9, wherein a cross-sectional area of the connecting portion of the insert metal is smaller than a cross-sectional area of a portion sandwiched between the joining ends. . 11. The method according to claim 6, wherein in the bonding step, the vicinity of the bonding end is heated by a non-contact heat source.
0. The method for manufacturing a stator of a rotating electric machine according to any one of the above items. 12. The joining step is resistance heating in which an electrode is brought into contact with the joining end to conduct current and heat the joint. Two or more sets of joining ends arranged in the radial direction are aligned with an inner diameter side and an outer diameter. The method for manufacturing a stator for a rotating electric machine according to claim 9, wherein the heating is performed while being sandwiched together by two electrodes arranged on the side. 13. The two electrodes disposed on the inner diameter side and the outer diameter side each have a roller shape, and heat the inner and outer sides of a plurality of sets of joined end portions arranged in the circumferential direction while rolling. The method for manufacturing a stator for a rotating electric machine according to claim 12, wherein